Perhaps Equis could consider upgrading to Nalpeiron Licensing Service v5.

It has the added advantage that VMWare blocking can be stopped.
http://www.nalpeiron.com/products/v5_new_features.asp

NLS is the third party activation method used by Equis.

In addition, the following text from their site at:
http://www.internetactivation.com/HelpDocs/NalpeironDocumentation/default.aspx?pageid=programming_errors_reported_as_problems

seems to indicate that it could be a stack size problem.

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